lewis structures

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005199302
Posts: 108
Joined: Fri Sep 28, 2018 12:15 am

lewis structures

Postby 005199302 » Mon Oct 29, 2018 10:35 pm

What are the exceptions to the octet rule? Is Br one of them?

ChathuriGunasekera1D
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

Re: lewis structures

Postby ChathuriGunasekera1D » Mon Oct 29, 2018 10:50 pm

Some of the exception are H, He, Li, Be because they don't have enough electrons to even make the octet. Sulfur, chlorine, silicon and phosphorus can all go beyond the octet, so they are also exceptions. There are some more for sure, but Br follows the octet rule (someone please correct me if I'm wrong).

gwynlu1L
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: lewis structures

Postby gwynlu1L » Mon Oct 29, 2018 11:22 pm

From what I remember from lecture, Lavelle said atoms in the 3rd row have the potential to have an expanded octet because the electrons in the d orbitals can become available for bonding. In addition, molecules that have an odd number of electrons such as NO or NO2 may be exceptions to the rule as well since there is no way to draw a lewis structure that gives each atom 8 electrons.

Nicklas_Wright_1A
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: lewis structures

Postby Nicklas_Wright_1A » Tue Oct 30, 2018 10:38 am

Nitrogen, Boron, and Beryllium are exceptions. They can have less than 8 valence electrons.


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